প্রশ্ন: Never before ___ in an earnest attempt to resolve differences.
(ক) have the leaders met
(খ) the leaders have met
(গ) met the leaders
(ঘ) the leaders had met
ব্যাখ্যা:
Rule: ‘Never before’ negative adverb হওয়ায় inversion হবে → have + subject + V3। এটি present perfect inverted form।